Wireless phonograph for hospitals



E. c. HANSON. WIRELESS PHONOGRAPH FOR HOSPITALS.

APPLICATION FILED JUNE 3, 1918.

1 ,38 1 ,82'7, Patented June 14, 1921.

' umrao s'rAT-ss- PAT T-- EARL C. HANSON, LOS ANGELES, CALIFORNIA,ASSIGNOB TO TI'JJLIEI IN SUBANCE AND TBU ST COMPANY, A CORPORATION 01'CALIFORNIA.

WIRELESS rnonoen'ern FOR nosrrrnns.

Application filed June 8,

To all whom it may concern:

Be it known that I, EARL G. -HANSON, a

. citizen of the United States, residing at Los Angeles, in the countyof Los Angeles and State of California, have invented a new and usefulWireless Phonograph for Hospitals, of which the following 1s aspoolfication.

My invention relates to the art of reproducing sound, and moreparticularly to the art of reproducing music by use of a phonograph orthe like.

The principal object of my inventlon 1s to provide a phonograph whlchmay be used to transmit music to a plurallty of persons who are out ofthe audible range of the phonograph proper.

" passage 18 forming a sound conduit is pro- My invention has a peculiarutility in connection with hospitals in which it is possible to installmy apparatus in such a manner as to be entirely inaudible to all thepatients except those provided with a receiving apparatus. I

Referring to the drawings whlch are for illustrative purposes onlyFigure 1 is a diagram showing the method of assembling and connectingthe sending apparatus to the phonograph.

Fig. 2 is a diagram of one form of a receiving apparatus. a

Fig. 3 1s a diagram of another form of a receiving apparatus.

Fig. 4 is a detail showing the method of mountin the transmitters on thephonograph, 13 is detail being shown partly in sectlon along a centralplane.

Fig. 5 is a section on a plane indicated by the line 5-5 of Fig. 4, thisplane being viewed in the direction of the arrows.

Fig. 6 is a diagram showing a modification of the apparatus necessary toadapt it to receive and transmit direct speech.

In the embodiment of m invention illustrated in these drawings, utilizean ordinary phonograph which may be of the disk type, as shown, therecord 11 being mounted on a table 12 turned by suitable means notshown. The reproducer 13 carrying the needle 14 is secured on the end ofa tone arm 15, which in turn is loosely con-' nected witha casting 16mounted on the top of the phonograph 17. A continuous vided through theinterior of the casting 16 and through the tone arm 15 to the reSpecification of Letters I'atent.

1913. Serial a... 288,045. g

used if desired, the object of the plurality of transmitters being toprovide a magnification of the sound.

Patented June 14, 1921.

L I have found,- however, that it is diflicult,

if not impossible to work the transmitters in multiple by sim lyconnectin them to common wires, and have devise a method 0%? overcomingthis difliculty, as shown in n this figure I provide a transformer 30having an iron core 31 and a single secondary 32. .As many primaries 33are provided as there are transmitters 20, each of the primaries beingconnected through a battery 34 with one, terminal wire 35 of each of thetransmitters 20, and the other terminal of each primary 33 beingconnected to a wire 36 forming the other terminal of all of thetransmitters 20. The primaries 33 are desirably as nearly identical asit is possible to make them with'respect to the number of turns andtheir relative magnetic position with relation to the core 31 and thesecondary 32. The secondary 32 is connected at 37 to ground and througha wire 38 with an antenna 39.

In practice the apparatus just described is placedat any convenientlocation in or near the hospital, and the antenna 39 is run in closeproximity to the building, as for example, around under the eavesor'along the roof.

The method of operation of my invention is as follows:

A record 11 being laced on the table 12 and the phono raph beingstarted, musical sounds travel t rough the passa es 18 and 19 andvibrate the diaphragms o the trans- -mitters 20 causing variablecurrents to flow in no condition to hear music.- In case it is desirableto allow a patient to hear the music, one or the other of the receivinsets shown in Fig. 2 or Fig. 3 may be use In Fig. 2, the patients cot isshown at 50, this cot being rovided with a mattress 51 which serves t epurpose of an insulator, the cot 50 being grounded solidly. A hlgh.efiiciency telephone receiver 52 is connected through a condenser 53directly to the cot 50, the other terminal of the receiver 52 .bemgconnected to a grip 54, which the patient desirin to hear the musicgrasps in his hand at t e same time plac ng the receiver 52 at his ear.The electrostatic field produced by the sendlng apparatus abovedescribed is sufliciently strong to induce a potential between the bodyof the patient and the ground, the body of the ggtient acting as oneside of a condenser. us to the variable charge produced by the variablestrength of the field,'the current will fiow from the patients bodythrough the receiver 52 producing sounds therein which are clearlyaudible to the atient, these sounds being the exact repro notion of themusi played by the phonograph.

In some cases it may be more convenient to use the apparatus shown inFig. 3, in which the cot 60 is mounted on insulators 61 and to which thereceiver 62 is connected through a condenser 63 to the cot and through awire 64 with the ground at 65.

In this case both the. patient and the cot itself furnish the necessarycapacity for collectingthe electrostatic field, the current flowing fromthe cot through. the receiver 62 and faithfully reproducing the originalmusic.

In some cases I provide the apparatus shown in Fig. 6 in which'a horn 70 1s placed on the casting 16 into which speakers may talk. It is thuspossible for the newspaper to be read into the horn 70, and for thevarious patients throughout the hospital who.

desire to do so, to listen to the news, the reefi'ected thereby.

What I claim is: 1. A wireless phonograph for use in hos- .pitals andthe like comprising a transmitter of electrostatic energy and areceiving system comprising a bed, a mattress formed of suitablematerial to insulate a patient from the bed, a telephone receiverconnected at one terminal to ground and means connected to the otherterminal of said" receiver for making an electrical connection to thebody of the patient. I

2. A wireless phonograph foruse in hospitals and the like whichcomprises a transing means comprising a telephone receiver connected toa condenser and the other terminal of said receiver connected to ametallic grip. I

3. A receiving system for electrostatic energy comprising a telephonereceiver, a connection from said telephone receiver to a capacity meansand another connection from said telephone receiver to the human bodywhereby said body serves as a collector mainder of the patients beingentirely un--- ,mitter of electrostatic energy and receiv-

